Question

Hexose monophosphate shunt does not take place when :

• A. Oxygen is not enough
• B. Glucose is the substrate
• C. NAD is available
• D. NAD is not available due to shortage of oxygen

Answer 1

Answer: (C)

NAD is available

Answer 2

When oxygen is available $NADH_2$ produced in EMP-Krebs cycle pathway is released in the form of NAD. When there is shortage of oxygen NAD is not available and NADP takes up its place.